Locomotive boiler



Od. 3, 1933. l Q MAR-11N, JR 1,928,861

LOCOMOTIVE BOILER Filed Oct. 16, 1931 4 Sheets-Sheet' l O O O O O O 38 OO O O O O Oct. 3, 1933.

Filed Oct. 16, 19,31

4 Sheets-Sheet 2 Oct- 3, 1933- J. c. MARTIN, JR

LOCOMOTIVE BOILER 4 Sheets-Sheet 3 Filed OCT.. 16. 1931 Zwen i0 Ot- 3,1933- J. c. MARTIN, JR

LOCOMOTIVE BOILER 4 Sheets-Sheet 4 Filed Oct. 16, 1931 Patented Oct. 3,1933 UNITED STATES PATENT OFFICE s Claims.

The invention relates to boilers, particularly locomotive boilers, andhas as an object the provision of means for attaching tubular elementsto the sheets of the boiler in such manner that the strain between theelementsl and the boiler sheets as occasioned by the heat of combustionwill be borne by the outside or wrapper sheet of the rebox. Y

`It is a further object of the invention to provide a structure for theattachment of tubular elements to boiler sheets utilizing stayboltsbetween the wrapper sheet surrounding the f1rebox and the ends of theelements as extended beyond the sheets forming the rebox, to take thestrains which tend to separate the elements from the sheets.

It is a further object of the invention to provide a means forconnecting tubular elements to the sheets of the firebox of a boilerwherein the rebox sheet has a positive bearing upon the walls of theelement to support the edges of the opening through which the elementprojects into the water space of the boiler, while forming an abutmentfor the element end against the firebox sheet, and also provide meansfor taking up the strain tending to separate the element from the sheetsby means of staybolts transmitting the strain to the Wrapper sheet.

It is a further object of the invention to provide a connectionl fortubular elements to firebox and wrapper sheets of the boiler which shallbe simple to install and wherein the strain-receiving elements will notbe exposed to the heat of the rebox.

It is a further object of the invention to provide a novel water bottomfor a locomotive Iirebox.

Further objects of the `invention will appear from the followingdescription when read in con- Fig. 4" is a detail perspective viewshowing a portion of the water bottom of the invention ;l Fig. 5 is adetail horizontal view partly in plan and broken away to reduceitslengthvshowing one of the tubular elements of the water bottom atnectionwith the accompanying drawings showtached to the sheets of the boiler inaccordance with the invention;

Fig. 6 is a vertical section on line 6--6 of Fig. 5;

Fig. 7 is a detail vertical section with a portion 60 broken away'online7-7 ofy Fig. 8;

Fig. 8 is a section von line 8-'8 of Fig. 7;

Fig.A 9 is a face View partly broken away of the attaching means ofFigs. 5 to 8 inclusive;

Fig. 10 is a face view of the connection of the 65 lower end of thetubular element to the-header of Figs. 5 to 8 inclusive;

Fig. 11 is a detail view corresponding to a portion of Fig. 5 showing amodied form of staybolt connection;

Fig. 12 is a face view partly broken away of the wrapper sheet of Fig.11;

Fig. 13 is a detail section on line 13-13 of Fig.

Fig. 14 is adetail vertical section of an end of 75 a tubular elementshowing a portion of a iirebox sheet with the lapped ends of the elementwalls riveted instead of weldedas shown in Fig. 8;

Fig. 15 is a View corresponding to a portion o Fig. 8 showing a furthermodification;

Fig. 16 isa vertical section on line 16--16 of Fig. 15; Y

Fig. 17 is a. detail section on line 17-17 of Fig.

Fig. 18 is a section on line 18-18 ofFig. 17;

Figs. 19 and 20 are detail perspective views from the inside of theflrebox showing further modiied `forms of attachment ofthe vtubularelements to the rebox sheet; and

Figs. 21 and 22'are detail vertical sections of 90 the ends of thetubular elements showing portions of the Iirebox sheet and illustratingfurther modied Vforms of the ends of the tubular elements. v

As shown in Figs. 1 to 4 inclusive, the firebox 95 to whichv theinvention'is applied comprises a llame space 10, a crown sheet 11, aWrapper sheet 12, inside side sheets 13, anda mudA ring 15.

The illustrative embodiments of the invention show its application tolocomotive boilers fired with injected fuel through burner 16 enteringthe firebox through opening 17 in the' usual mannel'.

The novel water bottom provided by the invention is shown as comprisingheader means'shown 105 as spaced tubular elements 18, and upwardly andVoutwardly sloping tubular elements 19. The elements 19 are shown asattached to and having their interiors opening into the header means 18.For suchattachment the elements 19 are shown 110 t tion in any of itsvarious embodiments.

as passing into openings in the walls of the header means 18, the jointbeing sealed by welding as at 20. To receive strain tending to separatethe elements from the header, the ends of the elements are shown as cutaway at 21, Fig. l, to provide extending plate-like members 22, the endsof said members passing through slots in the opposite wall of the headermeans and being clinched on the exterior thereof as shown at 23, thejoint being sealed by welding as shown at 24. A

To support refractory material in the space between'the header means 18,there is shown a horizontal plate 25 spanning the space between theheaders and having its ends upwardly turned as at 26, the upwardlyturned portion being welded l to the walls of the headers as at 27.

Between the separate elements and iiush with the lower Walls thereof,there are shown further plates 28 desirably welded to the walls of theelements and refractory material 29, 30 is provided to fill the spacesbetween the headers and between the tubular elements. The closure of thebottom of the firebox is completed by means of refractory end walls 31,32.

Desirably end plates 33, 34 are provided through which the ends of theheaders pass and which rigidly support the ends of the headers incorrect spacing and assist in confining the refractory material. Anl airinlet box is shown atv 35 in accordance with the usual practice.

The ends of the separate elements 19 may be secured to the side sheetsof the boiler in accordance with the structure provided by the inven-While this structure for attaching tubular elements to the sheets of theflrebox are shown herein as applied to the novel water bottom providedby the present invention, it will be understood that this structure isapplicable wherever tubular elements 40 forming a portion of thecirculatory and steaming system in the boiler are provided openingthrough lthe inside sheets of the boiler, whether the sheets are theside sheets and wrapper sheet or the crown sheetand wrapper sheets ofthe boiler` The showing of this connection in Fig. 2 is somewhatdiagrammatic and for detail illustration of various embodimentsof thisfeature of the invention attention is directed to Figs. 5 to 22inclusive.

In the form of Figs. 5 and 6 the tubular element A19, which is shown asflattened and formed with rounded edges desirably produced by bending aflat plate and joining the edges thereof by welding as indicated at 36,are passed through an opening 37 inthe flrebox sheet 13,'the joint beingsealed by welding as at 38. The end of the element projecting into theside water leg is cut away to provide plate portions 39, 40, whichportions are bent to overlapping position as shown in Fig. 6 andperforated at their overlapped portion as shown at 41 for engagement bykey-headed staybolt 42. The'staybolt passes through the wrapper sheet 12and has screw-threaded engagement with a nut '43, the lower. surface ofwhich is formed upon the portion of'a surface of a sphere to provideflexible bearing upon the edge of the opening in the wrapper sheet.

The 'nut 43 is shown as provided with projecting lugs 44 desirablyWelded to the outside surface wrapper sheet to prevent unscrewingthereof.

In application of this form of the invention, as well as each oftheother forms illustrated, to

lexisting boilers the already existing staybolt holes in the wrappersheet may be utilized and the spacing of the staybolts engaging the endsof the .Figs 21 and 22.

tubular elements will be correct to receive staybolts projecting throughthe existing openings, thus very greatly simplifying the application ofthe invention.

In the form of Figs. 7 and 8, the rounded ends of elements 19 inside thewater leg space is cut away as shown at 45 and the resulting plateportions 46, 47 are bent intooverlapping position and provided withinternally screw-threaded openings for engagement with the staybolts 48.In this form of the invention openings 49 are provided in the projectingplate portions for circulatory communication between the interior of thetubular element and the water leg. Also the staybolts 48 areshown aspassing through and having flexible bearing in externally threadedsleeves 50 which in turn are screwed into openings in the'wrapper sheetand asealing cap 51 is applied over the ends of the staybolts which areshown as slotted for engagement with an applying tool in the nature of ascrewdriver.

In the form of Figs. 11, 12, and 13 the plate portions of the endelements 19 are merely projecting into the water leg in spaced relationand opposite perforations 52 are provided for engage- 52, the nut 44securing the staybolt beingof the 105 form shown in Figs. 5, 6, and 9,

Fig. 14 shows the ends of the plate portions 47, 48 overlapped andsecured together by rivets 70, the overlapped ends being provided with atapped opening for a staybolt connection. f

To support the long edges of the perforation in the rebox sheet 13 andto provide a distancing stop for the end of the element 19 thereagainstas shown in the form of Figs. 15 to 21 inclusive, a shoulder is providedupon the wall of the elements 19 by inwardly deforming the end of theelement where it enters the opening in the firebox sheet and the openingin the sheet is designed to flt the exterior of the element as modifiedby the presence of the shoulder.

In the form of Figs. 15 and 16, the rounded edges of the element projectthrough the opening, while the substantially plain side walls of theelement are Yinwardly deformed as at 55 to provide shoulders 56 againstwhich the edges 57 of the opening in the sheet may bear. In this form.of the invention the inwardly turned and overlapping ends of theplate-like portions of the element are secured together byscrew-threaded members 58 for which rivets may be substitutedv ifdesired and the staybolts 59 are shown as engaging screwthreadedopenings in the overlapped ends, flexible staybolts being illustrated inthis as in other forms.

The openings 49. are alsor shown in each of Figs. 15 to 22 forthepurpose already described.

In the form of Figs. 17 and 18, the shoulders 56 are formed ina planeinwardly spaced from the plane of the side sheet and the edge of theopening in the side sheet'is inwardly flared as at 60 so as to bear atits edge upon the said shoulder, while the rounded edges of the elementare outwardly flared, as at 61, to join the edge of the opening in theside sheet by a butt weld 62.

The perspective view of Fig..19 illustrates the form of Figs. 15 and 16,and of Fig. 20 illustrates the form of Figs. 17 and 18.

Modified forms of element ends are shown in In Fig. 21, one of the plateends, at 63, is bent to provide a butt weld engagement at 64 with theother plate projection of the element and a threaded opening 65 isprovided for staybolt connection in the arc thus formed. Fig. 22 issimilar but the end 66 of the one plate overlaps the end 67 of the otherplate and is riveted thereto as shown at 68.

By the structure of the tubular element` connection, the necessity offorming extensive flanges upon the end of the tubular element isavoided. Any extensive perforating of the firebox and wrapper sheets forflanges and supporting staybolts therefor is also avoided and a stayboltconnection is provided whereby the strain between the tubular elementand the sheets of the rebox is borne through such staybolt connectiondirectly by the wrapper sheet out of influence of the intense heat ofthe iirebox.

Minor changes may be made in the physical embodiments of the inventionwithin the scope of the appended claims without departing from thespirit thereof.

I claim:

1. A boiler structure comprising, in combination, spaced firebox andWrapper sheets, a tubular element directly exposed to heat in thefrebox, having its walls sealed to the edges of an opening in the reboxsheet and opening into the space between said sheets, a portion of saidwalls extending into and terminating in the space between said sheets,said termination provided with a staybolt connection and a stayboltpassing through the wrapper sheet and engaging said connection. l

2. A boiler structure comprising, in combination, spaced firebox andwrapper sheets, a tubular element directly exposed to heat in thefirebox and opening into said space, the walls of said element sealed tothe edges of an opening in the firebox sheet, opposite portions of saidwalls extending into said space, Vone of said portions bent across thespace between said portions and secured to the opposite portion to forma yoke, a stayboltgconnection carried by said yoke and a stayboltpassing through said wrapper sheet and engaging said connection.

3. A boiler structure comprising, in combination, spaced firebox andwrapper sheets, a tubular velement directly exposed to heat in the reboxand opening into said space, the walls of said element sealed to theedges of an opening in the rebox sheets, opposite portions of said wallsextending into said space, said parts-turned to overlapping relation toform a double thickness yoke, said yoke provided Witha tapped opening toform a threaded staybolt connection, and a threaded staybolt passingthrough said wrapper sheet and engaged in said connection.

4. A boiler structure comprising in combination, spaced frebox andwrapper sheets, a tubular steaming and circulating element exposed toheat within the firebox and opening into the space between said sheets,said element having its full tubular wall sealed to the edges of anopening in the ilrebox sheet and a part of its tubular wall extendingthrough said opening and terminating between said sheets, saidtermination connected by staybolts to the wrapper sheet.

5. A boiler structure comprising in combination, spaced firebox andWrapper sheets, a tubular steaming and circulating element exposed toheat within the rebox and opening into the space between said sheets,said element having its full tubular Wall sealed to an opening in theiirebox sheets and having parts of its tubular wall projectingV beyondsaid opening and connected by strain-resisting bolts to the wrappersheet.

6. In a boiler structure: spaced rebox and wrapper sheets; a tubularsteaming and circulating element exposed to heat in the rebox having itswalls sealed to the edges of an opening in the rebox sheet; said wallsterminating in the space between said sheets; means not exposed to heatin the rebox for securing the element end to the wrapper sheetcomprising: an opening for a bolt in the terminating portion of saidwalls, and a bolt engaging said opening securing the element walls tothe wrapper sheet. V

'7. In a boiler structure: spaced firebox and wrapper sheets; a tubularsteaming and circulating element exposed to heat in the rebox having itswalls sealed to the edges of an opening in the rebox sheet; said wallsterminating in the space between said sheets; means for holding thewalls of said element in said opening comprising: a perforation in saidterminating portion thereof threaded for a staybolt, and a threadedstaybolt passing through the wrapper sheet engaging the threads of saidperforation.

8. In a boiler structure: spaced iirebox and wrapper sheets; a tubularsteaming and circulating element exposed to heat in the firebox havingits walls sealed to the edges of an opening in the firebox sheet; saidwalls terminating in the space between said sheets and said terminatingportion having surfaces adapted for a staybolt connection; a stayboltpassing through the wrapper sheet engaging said surfaces; and means fortightening said staybolt against the wrapper sheet and said surfaces.

JESSE C. MARTIN, JR.

